<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{this.currentCity}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)"> <!--热门城市 -->
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
        <div class="area" v-for="(item,key) of cities" :key="key" :ref="key"> <!-- 城市列表页--->
          <div class="title border-topbottom">{{key}}</div>
          <div class="item-list">
            <div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id" 
            @click="handleCityClick(innerItem.name)" >{{innerItem.name}}
            </div>
          </div>
        </div>
      </div>
  </div>
</template>
<script>
import { mapState, mapMutations } from 'vuex'
import Bscroll from 'better-scroll' // 引用一个下拉的插件
export default {
  name: 'CityList',
  props: {
    cities: Object,
    hot: Array,
    letter: String
  },
  computed: {
    ...mapState({
      currentCity: 'city'
    })
  },
  methods: {
    handleCityClick (city) {  //城市切换
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper, {
      click: true
    })
  },
  watch: {
    letter () {
      // console.log(this.letter)
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>
<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color #ccc
    &:after
      border-color #ccc
  .border-topbottom
    &:before
      border-color #ccc
  .list 
    overflow hidden
    position absolute
    top 1.58rem
    left 0
    right 0
    bottom 0
  .title
    line-height .54rem
    background #eee
    padding-left .2rem
    color #666
    font-size .26rem
  .button-list
    padding .1rem .6rem .1rem
    overflow hidden
    .button-wrapper
      width 33.33%
      float left
    .button
      text-align center
      margin .1rem
      border .02rem solid #ccc
      padding .1rem 0
      border-radius .06rem
  .item-list
    .item
      line-height .76rem
      padding-left .2rem
</style>
